Ncert- class 6- science-Chapter 11: Air Around Us 1 Welcome to your Ncert- class 6- science-Chapter 11: Air Around Us 1 1. Choose the option which justifies the given statement:-Air is considered a mixture, not a compound. Air does not have a fixed formula like compounds. It is possible to separate air into its constituent gases by physical methods like fractional distillation. All of the above Air shows properties same as the constituent gases present in it. None 2. Which of these statements are true about air?(i) Air is a mixture of several types of gases.(ii) Air exerts pressure.(iii) The composition of air is constant in the atmosphere. (ii) and (iii) (i) and (ii) (i) and (iii) (i), (ii) and (iii) None 3. Carbon dioxide constitutes nearly ___ % of the atmosphere. 0.03 45 28 78 None 4. Carbon exists in the atmosphere in the form of: carbon dioxide only coal carbon monoxide in traces and carbon dioxide carbon monoxide only None 5. What process replenishes the atmosphere with oxygen? Both A and C Water Cycle Photosynthesis Oxygen Cycle None 6. Glass panes usually appear hazy because: they are old. None it is the property of transparent substances water vapour settling on the tiny dust particles. None 7. Which is the most abundant gas in our atmosphere ? Carbon monoxide Oxygen Carbon dioxide Nitrogen None 8. __________ is the most abundant gas in the atmosphere. Carbon dioxide None of the above Oxygen Nitrogen None 9. Combustion can not take place without: carbon zinc water Air None 10. Which of the following gases burns in air Nitrogen Carbon dioxide Carbon monoxide Helium None 11. Air is regarded as a mixture because: its volume changes under different conditions its composition may vary its pressure may vary its temperature may change None 12. What is the major constituent of air Water vapour Oxygen Nitrogen Hydrogen None 13. Air has________ composition with________ oxygen at high attitudes. fixed, more variable, less fixed, less variable, more None 14. Which one of the following gas does not form a part of the atmosphere? Carbon dioxide Nitrogen Oxygen Chlorine None 15. A greenhouse gas that absorbs energy and maintains earth's temperature is: argon nitrogen oxygen carbon dioxide None 16. The percentage of nitrogen and oxygen in air is: 99% by volume 37% by weight 50% by weight 21% by volume None 17. It is not proper to breathe through our mouth because: the dust particles would enter our bodies more carbon dioxide will be inhaled we will catch cold easily our throat will become sore None 18. John finds that, as he blows air into a balloon, it becomes bigger. What inference can John make? Air is matter Air has mass Air occupies space Air is a gas. None 19. Which of the following gases do not form part of the atmosphere? Oxygen Carbon idoxide Chlorine Nitrogen None 20. The correct ascending order of gases as per their composition in air is: oxygen < carbon dioxide < nitrogen nitrogen < hydrogen < oxygen oxygen < carbon dioxide < hydrogen hydrogen < oxygen < nitrogen None Time's up Please Share This Share this content Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Opens in a new window Leave a Reply Cancel replyCommentEnter your name or username to commentEnter your email address to commentEnter your website URL (optional) Save my name, email, and website in this browser for the next time I comment.
